What do you need to complete this? Siren and what else? anyone has the part numbers?

 

You mean the Piezo from Radio Shack?

https://www.hdforums.com/forum/touri...-2011-rgc.html

Same install on my 09 Ultra.

 

Doesn't it go off the same amount of time as the lights did before the siren was added? Something like 30 sec. Of course if you keep moving it, then it will keep going off. I never did test mine, but the chrip is reassuring.

 

just finished installing the radio shack siren, works great. siren will shut off after 30 sec. I didnt time it but thats a good guess. plenty loud

 

I can't recall the amount of time, but last time I checked, all vehicle alarms, car and motorcycle, have timeouts with a max of a few minutes. Most states and localities have noise nuisance ordinances regarding sounds like this so the alarm manufacturers have timeouts built in.